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Finding the Fourth Proportional to 231.50, 319.48 and 128

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Solution

The fourth proportional to 231.50, 319.48 and 128 is: 176.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.50 : 319.48 = 128 : x
  2. Step 2: Convert to fraction form
    231.50/319.48 = 128/x
  3. Step 3: Cross multiply
    231.50x = 319.48 × 128
  4. Step 4: Simplify right side
    231.50x = 40,893.44
  5. Step 5: Solve for x
    x = 40,893.44/231.50
  6. Step 6: Final answer
    x = 176.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.